Ss (N = 8) were precooled by cold water immersion prior to one of two trials of attempting to run the greatest distance possible in 30 minutes while self-controlling treadmill speed in 32 degrees Celsius with 60% humidity.

Precooling significantly increased the distance run (304 m) and decreased pre-exercise rectal and mean skin temperatures. During the exercise, body temperature remained lower than in the non-cooled trial. There was no difference in VO2 between the two conditions.